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Segmented Information (Details Textual) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Operations
Market
Country
Dec. 31, 2010
Dec. 31, 2009
Segment Reporting Information [Line Items]      
Equity income $ 121 $ 132 $ 112
Sales 28,748 23,465 16,876
Schedule Of Equity Method Investments [Line Items]      
Sales of E-Car 881 698 578
Fixed assets 158 155  
Segmented information (Textual) [Abstract]      
Number of manufacturing operations 286    
Number of Countries in which Entity Operates 26    
Number of primary markets 2    
E-Car [Member]
      
Schedule Of Equity Method Investments [Line Items]      
Sales of E-Car 92 20 5
Adjusted EBIT loss 91 89 45
Fixed assets 77 76 15
Operating Segments [Member]
      
Segment Reporting Information [Line Items]      
Number of product development, engineering and sales centres 88    
Corporate and other [Member]
      
Segment Reporting Information [Line Items]      
Equity income 66 30 0
Sales   8  
Adjusted EBIT loss   50  
North America [Member]
      
Segment Reporting Information [Line Items]      
Sales 14,855 12,370 7,997
Rest of World [Member]
      
Segment Reporting Information [Line Items]      
Sales $ 1,599 $ 1,016 $ 650